IPO Price Band Revision: What SEBI Allows and What It Signals for Your Bid

Most of us treat an IPO’s price band as fixed the day the advertisement comes out. It isn’t, and when an issuer changes it halfway through the bidding window, you should pay attention. An IPO price band revision is one of the few moments when the company and its bankers publicly admit that the market’s view of the price is different from theirs. This guide covers what the SEBI rules actually allow, how the bid dates shift, what happens to a retail bid already sitting in your ASBA account, and how we’d read a revision before deciding whether to stay in.

The rules quoted here come from the SEBI (Issue of Capital and Disclosure Requirements) Regulations, 2018, consolidated up to March 21, 2026, SEBI’s General Information Document for investing in public offers and SEBI’s FAQ on the ICDR Regulations. The company, prices and lot size in the worked examples are made up.

The band before anyone touches it

Quick refresher. In a book-built issue the company puts a floor and a cap in front of investors, and the final price is found inside that range. Regulation 29 of the ICDR rules sets the shape: the cap can be at most 120% of the floor, and since a 2022 amendment it has to be at least 105% of the floor. The floor, or the final price, can’t be below the face value of the share.

The band also has to be announced at least two working days before the issue opens, in the pre-issue and price band advertisement, along with financial ratios worked out at both the lower and upper end. If you want the longer walk-through of how floor, cap and spread work, our post on the price band in IPO bidding covers it.

Take a hypothetical issue with a band of ₹200 to ₹210. The cap is exactly 105% of the floor, the narrowest SEBI allows. The widest band on a ₹200 floor would run up to ₹240.

What SEBI allows in an IPO price band revision

The band can be changed while bidding is on. The detail sits in Schedule XIII of the ICDR rules, the part that describes the book-building process. Four conditions matter:

• How far it can move. The maximum revision on either side is 20%. In plain terms, the floor can move up or down by up to 20% of the floor disclosed in the red herring prospectus, and the new cap still has to sit between 105% and 120% of the new floor.
• Who has to be told. The revision has to be widely disseminated: informing the stock exchanges, a public notice, and the change shown on the relevant website and the syndicate members’ terminals.
• Extra days. The bidding period gets extended under the rules on subscription periods, which we come to below.
• A funding disclosure if the band is cut. If lowering the band leaves a shortfall in project financing, the issuer must disclose how it will be met, in the red herring prospectus or the public notice, and allotment can’t happen until the financing is tied up.

Run our ₹200 floor through that. Twenty percent of ₹200 is ₹40, so a revised floor could land anywhere from ₹160 to ₹240. A cut to ₹180 to ₹189 is within the rules (₹189 is 105% of ₹180). So is a raise to ₹220 to ₹231 (₹231 is 105% of ₹220). A cut to ₹150 isn’t, because that is 25% below the original floor.

A revised band is the one time an issuer tells you, in a public notice, that its first read of demand was wrong.

How the bid dates move

Regulation 46 says a mainboard IPO stays open for at least three and no more than ten working days. If the band is revised, the issuer has to extend the bidding period disclosed in the red herring prospectus by at least three working days, and the total still can’t go past ten. For bid periods and price band announcements, a working day means a day other than a Saturday, Sunday or public holiday on which banks in the city named in the offer document are open.

Here’s what that looks like. Our issue opens on a Wednesday and is due to close on Friday, three working days. On Thursday the band is revised. The close has to move out by at least three working days, so with no holidays in between it now shuts the following Wednesday. That’s six working days in all, comfortably inside the cap. An issue that had already been scheduled for eight working days is a different story: three more days would take it to eleven, over the ten-day limit.

One small thing that trips people up. The force majeure extension, used for a banking strike or similar unforeseen events, is a separate rule. Since an amendment effective May 18, 2024, that extension can be as short as one working day, down from three. SEBI’s 2020 information document still shows the older three-day wording, so if you read the two side by side, the regulation is the one that counts. The three-day minimum for a price band revision didn’t change.

What happens to a retail bid already in the book

This is where a revision stops being theory. A retail individual investor, under ICDR, is one who bids for not more than ₹2 lakh. Retail bidders can revise or withdraw their bids until the issue closes. Qualified institutional buyers and non-institutional investors can’t withdraw or lower their bids at any stage. And only retail investors (plus eligible employees and retail shareholders in a reservation portion) get the cut-off option, which says “I’ll take whatever the final price is”.

Say the lot size is 70 shares. At the old cap of ₹210, one lot costs ₹14,700. Thirteen lots, or 910 shares, is ₹1,91,100. Fourteen lots would be ₹2,05,800, over the retail limit, so 13 lots is the most a retail bidder can apply for. Assume you bid 13 lots at cut-off and ₹1,91,100 is blocked in your account.

If the band is cut to ₹180 to ₹189

At the new cap, your 910 shares cost ₹1,71,990. SEBI’s information document says a cut-off retail bidder can either revise the bid or have the excess unblocked. The excess here is ₹19,110. If you’d rather use the room, a lot now costs ₹13,230, and 15 lots (1,050 shares) come to ₹1,98,450, still under ₹2 lakh.

The same document has a rule for the other side of the line. If a revision brings a non-institutional bid down to ₹2 lakh or less, and the bidder is eligible for the retail category, the bid is considered for allocation as retail. A 1,050-share bid is ₹2,20,500 at ₹210 but ₹1,98,450 at ₹189, so it would cross over.

If the band is raised to ₹220 to ₹231

Now your 910 shares would cost ₹2,10,210 at the new cap, which is above ₹2 lakh. The information document says that if a retail bid goes over ₹2 lakh after revision, it may be considered in the non-institutional category, and a cut-off bid in that position can be rejected. So topping up all 13 lots isn’t a clean option. Twelve lots, or 840 shares, cost ₹1,94,040 at ₹231, which means blocking another ₹2,940.

What if you do nothing? The document covers that too. If a retail bidder neither revises nor pays the extra amount, and the final price ends up above the old cap, the number of shares is adjusted downwards so no additional payment is needed. Your ₹1,91,100 covers about 827 shares at ₹231. In whole lots of 70, that’s 11 lots, or 770 shares. You aren’t thrown out, but you’ve quietly lost two lots.

The practical point: after an upward revision, check your bid. Don’t assume the bank or the app has handled it. Revision forms need every bid option filled in, not only the one you’re changing, and the extra money has to be blocked through the same intermediary that took the original bid.

Reading what a revision signals

The rules tell you what can happen. They don’t tell you why it happened, and that’s the part worth thinking about.

A downward revision usually means the book wasn’t filling at the original band. The issuer has chosen a lower price over a thin book. The funding disclosure is the useful bit here: if the company is raising fresh money for a project, the notice has to say how any shortfall from the lower price will be met. Read that line. A company that says “internal accruals” or “debt” is telling you the project now leans on its balance sheet more than the prospectus suggested.

An upward revision reads as strong demand, but be careful about chasing it. A higher band means you pay more for the same business. The financial ratios in the price band advertisement were worked out at the old band, so redo the basic maths, such as the price-to-earnings multiple, at the new cap before you increase your bid.

After an upward revision you are paying more for the same company, so the valuation check has to be done again at the new cap.

Either way, you aren’t flying blind. Schedule XIII requires the demand at the end of each bidding day to be shown on the syndicate terminals and the stock exchange websites. A revision followed by three extra days gives you time to watch how the book responds. If a cut band still isn’t drawing bids by the second extra day, that tells you something too. Our explainer on the book building process covers how that demand turns into a final price.

A short checklist when a band is revised

• Read the public notice on the exchange website: new floor, new cap and new closing date.
• Check the revision is inside the 20% limit on either side of the original floor. It’s a ten-second check.
• If the band was cut, find the line on how any funding shortfall will be met.
• If you bid at cut-off, work out what your blocked amount buys at the new cap and whether you are still under ₹2 lakh.
• Recompute valuation at the new cap instead of relying on the old advertisement’s ratios.
• Use the extra days. Watch the daily demand figures before you revise, top up or withdraw.

For the wider picture on applying to IPOs, from reading the red herring prospectus to allotment and listing, start with our pillar guide on IPO investing in India.

The short version

An IPO price band revision lets an issuer move its band up or down by as much as 20% of the original floor while bidding is open. It has to tell the market publicly, keep the issue open at least three more working days and stay inside the ten-day limit. Retail bidders get to revise or walk away; institutions and big non-institutional bidders can’t pull out. Whether the band moves up or down, it’s new information, so read it as information. Recheck your bid, recheck the price, and use the extra days.

Disclaimer: This article is for information and education only and is not investment advice or a recommendation to apply for, buy or sell any security. The company, price bands, lot size and bids in the worked examples are hypothetical and used only to show how the rules work. Always read the red herring prospectus and the issuer’s public notices for the actual terms of any issue. Investing involves risk, including the loss of capital. Please consult a SEBI-registered investment adviser before making investment decisions.